Fluid dispensing apparatus



Jan. 31, 1933. PEPPER 1,896,056

FLUID DISPENSING APPARATUS Filed Nov. 27. 1931 13 Sheets-Sheet l 3 v 3 4 f l7 0 0 0 I 59 il 9 P l W ""1 or :m m3 8 m w 2 Y9 Y7 v 45 7 qan'ag emenf 3 I15 U #9 e e 2 T 35 B. J. PEPPER Jan. 31, 1933.

FLUID DISPENSING APPARATUS Filed Nov. 27, 1931 13 Sheets-Sheet 2 v BY ATTORNEY B. J. PEPPER Jan. 31, 1933.

FLUID DISPENSING APPARATUS Filed Nov. 27 1931 13 Sheets-Sheet 3 INVENTOR 1H 1/ we a :1, I! i: i

,ATTORNEY w w w 13 Sheets-Shegt 4 B. J. PEPPER FLUID DISPENSING APPARATUS Filed Nov. 27

'Jan. 31, 1933.

ATTORNEY V G .NV'ENTOR B. J. PEPPER Jan. 31, 1933.

FLUID DISPENSING APPARATUS 13 Sheets-Sheet 5 Filed Nov. 27 1931 ATTORNEY Jan. 31, 1933. PEPPER 1,896,056

FLUID DI SPENS ING APPARATUS Filed Nov. 27. 1931 13 Sheets-Sheet 6 I /;zq$, 20 rg /9. {Q

1/ 50 67\ zu 70 99 52 L in)" 3 69 5] 71 6y 5P 7? Q%/MW ATTORNEY,

Filed Nov. 27, 1931 13 Sheets-Sheet 7 ATTORNEY Jan. 31, 1933. a. J. PEPPER FLUID DISPENSING APPARATUS Filed Nov. 27. 1931 13 Sheets-Sheet 8 ATTORNEY Jan. 31, 1933.

B. J. PEPPER FLUID DISPENSING APPARATUS Filed Nov. 27. 1931 7y 7 :17 7 i 5.5- 76 i 73 50 1 :1 67 619 f S 70 I h I 69 5 I 53 51 fag 77 :4 j i 7 I f- 0 Y6 Y5? 6 40 if 59 8 13 Sheets-Sheet 9 ATTORNEY Jan, 31, 1 B. J. PEPPER A FLUID DISIENSING APPARATUS Filed Nov. 27, 1931 13 Sheets-Sheet l0 X INVENTOR ATTORNEY Jan. 31,1933. B. J. PEPPER l396,056

FLUID DI S PENS ING APPARATUS Filed Nov. 27. 1931 13 Sheets-Sheet 11 INVENTOR ATTORNEY Filed Nov. 27, 1951 13 Sheets-Sheet 12 I a a a I a:

CZAW 1 ATTORNEY Jan. 31," 1933. B l PEPPER 1,896,056

FLUID DISPENS ING APPARATUS Filed Nov. 27. 1931 13 Shts-Sheet 1a ATTORNEY Patented Jan. .31,

UNITED. STATES PATENT OFFICE BYRON II I'mrnn. or rear WAYNE, INDIANA, AssmNon *ro roxnnm 01L 'rANx m rum COILPANY, A CORPORATION or INDIANAv FLUID DISPENSING APPARATUS lication ma November 27. 19: 1; Serial Nat-17,350.

This invention relates to im rovements in fluid dis ensing apparatus. ne' of theobjects of t e improvement is to provide means tity of fluid dispensed thereby. And a furdrawings, in which for fluid and an mdicatin rovide a pumping means means therefor so constructed that the in icating means is operated only and to such extent as delivery of fluid through the pumping means is effected.

ther object is to Otherobjects and advantages of the inven-' tion will appear hereinafter.

A preferred illustrative embodiment of the invention is shown in the accompanying Fig.1 is a front elevation of an apparatus in which the invention is embodied, a portion thereof being broken away;

Fig. 2 is a. fragmentary elevation of the appliance projected from Fig. 1, portions being shown in section;

Fig. 3 is a fragmentary top plan view of the pump cylinder and the plunger therein Fig. 4 is a vertical section of the lower portion of the pump including the plunger and inlet valve;

Fig. 5 is a rear elevation of the pump mechanism, a portion thereof being in section;

Fig. 6 is a. projection of Fig-5 at right angles thereto;

Fig. 7 is a. detail view of a part of the valve operating mechanism for the pum Fig. 8 is a vertical section of t e engine for actuating the pump;

Fig. 9 is an elevation projected fromFig. 8, parts being shown in section;

Fig. 10 is a detail view showing a transverse section of the. valve actuating mechanism for the engine;

Fig. 11 is a detail view showing-a vertical section through a part of the indicating mechanism;

Fig. 12 is a fragmentary plan view of the resetting mechanism, a portion thereof being in section;

Fig. 13 is an elevation projected from Fig.

12, a portion thereof being in section;

Fig. 14 is a front elevation of the indicating mechanism; i Fig. '15 is a vertical section projected from Fig 14;

F igl. 16 is a rear elevation projected from i l v 4 Fig. 17 is an elevation of the valve operatin mechanismfor the machine, the parts being positioned as at the commencement of. the cycle of operation thereof;

Fig. 18 is anelevationprojected from Fig.

17 in a plan at right an les thereto;

Fi 19 and-20, 21 and 22, 23 and 24, 25 and 26, 2 and 28, 29 and 30, 31 and 32, and also 33 and 34 are views corresponding with Figs. 17 and 18 with the parts disposed in corresponding successive stages in the c cle of op eration of the .valve. operating mec anism;

Fig. 35 is a fragmentarycross section of Fig. 33 on the line 35-35 thereof;

ig. 36 is an'end view of a driving clutch angits actuator for the indicator gearing; an r Fig. 37 is'a detail side view of the clutch and actuating mechanism for the indicator gearing, portions being invsection.

Figs. 3 and 4, and 7 to 37 inclusive, are eachdrawn uponan enlarged scale.

The illustrative embodiment of the invention is in a form suited for dispensin lubricants such as grease, semi-liquid, oi 3, etc., andcomprises a frame 1 having'a base 2. Upon the top of the frame is supported an engine having a cylinder 3, piston head 4 and a valve 5, and in connection with the bottom of the frame is disposed a ump having a cylinder 6 and a piston 7. T e engine cylinder 3 and the pump 0 linderfi'are axially alined, and the pistonead 4 of the engine and the piston 7 of the pump areconnected by a piston rod 8 and have simultaneous movement in their respective cylinders. (Fig. 2.)

The engine cylinder 3 has'an intake port 9 v respectively through which air under pressure is supplied to the cylinder in the opposite ends thereof alternately as the valve is actuated. (Figs. 8 and 9.) The valve is so constructed as to establish communication between the intake port and one or the other of the communicating ports 10 and 11 accordingly as said valve is shifted from one of its positions to the other. The intake port 9 has communication with a valve-case 12 in which is located a spring-pressed check-valve 13 that controls the admission of compressed air to the intake port as it is supplied through a pipe 14 from any suitable source. Also, in said valve case is located a spring-pressed safety valve 15 that normally bears upon the check-valve 13 with suflicient force as to hold the check-valve open and thus permit air from the supply pipe 14 to enter the intake port 9. The spring 16 on the safety valve is compressed more or less accordingly as a threaded sleeve 17 through which the stem 18 of the safety valveextends is adjusted. In this manner the check-valve is held open with more or less force. In the event the ressure of air supplied through the pipe 14 ecomes excessive the safety valve is raised in opposition to its spring 16 which permits the check-valve to close. Thus, the supply of air pressure to the engine cylinder is auto matically regulated. v

The valve case has therein a vent 19 whereby freedom of movement of the safety-valve is permitted. As air is admitted through the port 10 into the lower end of the cylinder the iston-head 4 therein is raised during whic period air from the upper end of the c linder is exhausted through the port 11 out t rou b one end of the bore 20 for the valve 5. en the valve 5 is shifted so that air is admitted into the upper end of the cylinder throu h the port 11 the piston-head 4 is force? downwardly durin such period the air in the lower end of t e cylinder is exhausted through the port 10 out through the adjacent end of the bore for the valve 5.

The engine cylinder 3 has at its lower end a. head 3' in which is located the bore 20 for the valve 5, and is provided with a stufiing box 21 for the piston rod 8.

The pump has upon the upper end of its cylinder 6 a head 22 (Fig. 2) provided with.

a surplus discharge port 23 and also a disensing outlet port 24, and is provided at its ower end with a head 25 (Fig. 3) containing an inlet check-valve 26 and having connected with its lower end a suction pipe 27.

The check-valve 26 has therein an opening 28 which permits passage therethrough of a sufficient amount of fluid from the lower end of the pump cylinder into the suction pipe as to relieve excessive pressure in the suction pipe or lower end of the cylinder upon operation of the plunger in either direction. Such relief has been found desirable especially when the transient material is in the form of a grease or heavy oil as it permits the check-valve to function smoothy, and furthermore admits of a compensating back-flow of liquid displaced in the upper end of the pump cylinder by the piston-rod 8.

The pump piston has a head 29 which is secured to the lower end of the piston-rod 8 and has therein an annular series of passageways 30 that are normally closed by a pliant valvular annulus 31 formed of suitable materials, such as leather, said annulus being wa s.

I n the head 22 is disposed a spring-pressed outlet check-valve 34 that controls passage of fluid from theupper end of the pump cylinder 6 out through the dispensing outlet port 24, there being provided a vented chamber 35 in said head in which operates a piston 36 on the stem of the check-valve 34 by which arrangement said check-valve is balanced with respect to pressure of the fluid in the outlet port 24. Also, in the head 22 is disposed a surplus outlet check-valve 37 that controls passage of fluid from the upper end of the pump cylinder 6 out through the surplus discharge port 23, there being provided a guidewa 38 in said head in which 0 erates a das -head 39 on the stem of the chec valve 37 by which arrangement leakage of fluid through the head is prevented.

U on the upper end of the stem 40 of the chec -valve 37 (Fi 7) are disposed a flanged collar 41 adjustab y secured thereon, a com pression spring 42 and a thimble 43 having imited axial movement upon the stem. The

thimble has at its lower end an external flange 3 44 and is sustained inits uppermost position on the stem by said spring.

Within the frame 1 is pivotally mounted a rocker 45 upon a stationary shaft 46 which rocker engages the flange 44 of the thimble 43, and has a roller47 which bears against the face of a cam 48 that is mounted upon a rotatable shaft 49 in the frame (Fig. 5). The outer periphery of the cam is so shaped as to have sequentially a concentric face 50, a minor depression 51 and a major depression 52, and the eriphery of the cam bears against the roller 4 on the rocker which is actuated upon rotation of the cam. While the concentric face of the cam has contact with the roller the thimble 43 is completely depressed so as to bear on the flange of the collar and thereby the check-valve 37 is held positively closed; while the roller 47 registers with the minor depression 51 the thimble 43 is pressed downwardly so as to 'artially compress the spring 42 and thus t 1e check-valve 37 is yieldingly restrained from opening; an when the roller 47 registers with the major depression 52 the thimble is relieved entirely from ressure of the rocker and thus is permitted free opening of the check valve 37.

The cam shaft 49 has thereon a pinion 53 which meshes with a rack-member 54 that is a secured on the piston-rod 8 whereby oscillating movement is imparted to the camshaft as the piston rod reciprocates.

The valve 5 of the c.. gine is reciprocated b a mechanism disposed inthe frame whic consists of a lever 5 pivotally mounted upon a bracket 56 that depends from the head 3 of the engine cylinder, and an actuatin rod 57 therefor, the upper end of said rod eing pivoted to the lever. The actuating rod 57 is loosely mounted in a pair of relatively movable slides 58 and 59 disposed in parallel planes closely adjacent each other. The

' thereto.

slide 58 has at its bottom a forwardly extending ledge 60 and at its top a forwardly extending ledge 61 having a laterally projecting finger 62 hereinafter referred to, and a stationary post 63in the frame extends loosel throu h said ledges and constitutes a gui e for said slide. The slide 59 has at its upper end a forwardly extending ledge 64 through which said post extends and which overhangs the upper ledge 61 on the slide 58 whereby u ward movement of the slide 58 is limited re ative to the slide 59. Also, the slide 59 has a laterally extendingportion 65 that bears against a guide 66 positioned in the frame whereby turning movement of the slide 59 upon the post 63 is prevented (Figs.

15 and 32). Turning movement of the slide 58 u on said post is prevented by the slide 59 w ich extends in a plane closely ad'acent The slide 58 has a forwardly extending lug 67 i and the slide 59 has a forwardly extending lug 68 through which the actuating rod 57 loosely extends, and on said rod at a point between said lugs is secured a collar 69. Between the lug 67 on the slide 58 and the collar 69 on the rod 57 is disposed a compression spring 70 and between said collar and the lug 68 on the slide 59 is disposed a compression 5 ring 71. By means of said sprin the Sll( es are yieldingly sustained in t eir normal positions with respect to each other and also with respect to the acd the lock-bar 72 and the bracket 75 which tends to hold the lock-bar in either of its engaging positions with said bracket. The rack-member 54 has a forwardly extending lug 77 provided with two adjustable sleeves 78 and 79 vertically disposed through which the 0st 63 loosely extends. The sleeve 78, as the upward stroke of the piston-rod 8 is being completed has engagement with the ledge 61 on the slide 58 (Figs. .19 and 20), whereupon the slides 58 and 59 are raised which causes compression of the spring 71, and also the inner end of the lock-bar is elevated through the medium of a finger 80 which projects from the slide 59 and has operative enga ement with said bar. In this manner the 100 -bar is released from the en. gagement of the stationary bracket 75 in its notch 74' which permits the valve lever 55 to turn upon its pivot 55' through action of the rod 57 by pressure of the 5 ring 71, and thus the valve 5 is moved to its orward position and the bracket 75 becomes engaged in the notch 74 of the lock-bar 72 causing downward stroke of the piston rod (Figs. 21 and 22). The sleeve 79, as the downward stroke of the piston rod is being completed,

' has engagement with the ledge 60 on the plate 58 (Figs. 25 and 26) whereupon the slide 58 is moved downwardly causing compression of the spring 70, and also, the finger 62 on the ledge 61 of the plate 58 bears downwardly upon the outer end of the lock-bar 72 cansing the inner end of the lock-bar to tilt upwardly, in which manner the lock-bar is released from the engagement of the stationary bracket 75 in its notch 74 which permits the valve lever 55 to turn upon its pivot 55 to its former position through action of the rod 57 by pressure of the spring 70, and thus the valve 5 is returned to its rear position and the bracket. 75 becomes re-engaged in the notch-74' in the lock-bar 72 which actions are followed by the down-stroke of the engine piston and the pump. Also, as the actuating rod 57' is moved downwardly by expansion of the spring 7 0, the spring 71 becomes partially compressed against the lug 68 on the late 59 causing said plate to move downwar ly to its normal position. Movement of the valve 5 from one of its positions to the other causes reversal of the engine normally at the corresponding ends of its strokes, and the valve 5 is held in each instance stationary because of the engagement of the lock-bar 72 with the bracket 75.

The pum and the ful normal stroke of the plunger 7 is of such length that the fluid expelled from the pump cylinder upon the up-stroke of the piston exceeds a definite predetermined quantity thereof, the excess portion being expelled cylinder 6 is so proportioned the pump cylinder by the action of the piston.

To insure that the fluid dispensed fromfthe pump through the outlet port 24 is accurate in quantity, it is essential that accumulations of air that may be drawn into the pump be ejected along with the excess fluid through the surplus outlet 23 before commencement of delivery of the measured fluid throughsaid outlet port 24. Provision is therefore made for such elimination of air from the upper end of the pump cylinder past the surplus check-valve 37, which provision also acilitates priming of the pump.

There is provided means for causing pal pitation of the pump through action of the engine whereby fluid is drawn into the pum until its cylinder is completely filled wit said substance before expulsion thereof takes place through the outlet port 24. Such means comprises a priming latch 81 that is pivotally mounted upon the lower end of the slide 58 and which has a hook 82 adapted, at the end of the down-stroke of the pump, to have engagement with a lug 83 that projects from the side of the lug 77 on the rack-member. so that when said latch has such engagement and the rack-member is raised, upward movement is correspondingly imparted to the slide 58 causing premature reversal of the pump mechanism.

The priming latch 81 is yieldingly sustained in lock ng position by means ofa tension spring 84, the opposite ends of which are respectively attached to said latch and slide 58, and the latch has a stud 85 that projects into the path of a collar 86 adjustably positioned on the stem 40 of the check-valve 37 for the surplus outlet (Figs. 21, 27and 33) whereby when said check-valve is raised to. open position while the slide 58 is at the end of its down-stroke the latch is thrown out of locking engagement with the 1ug\83, thus permitting full upward stroke of the pump. When the pump is at the end of its downstroke the roller 47 on therocker 45 registers in the minor depression 51 of the cam 48 (Figs. 25, 27 and 31), whereupon the check-valve 37 is yieldingly restrained from opening because of the pressure of the spring 42 in the thimble 43 which is partially depressed by the rocker 45. In this manner at the commencement of the up-stroke-of the pump, if the up er end of the pump cylinder contains air, tie air becomes compressed a air from the with of the finger 80 therein without consequent raising of the check-valve,-thus permitting the latch to remain engaged with the lug on the rackmember.

As the up-strolre of the pump continues (Figs. 33 and 34), the slides 58 and 59 are correspondingly raised because of engagement of the latch 81 with the rack-member; thespring 71 is compressed; the cam 48 is turned so that theroller 47 enters the major depression 52 in the cam, whereupon pressure of the rocker 45 on the thimble 43 is entirely relieved; and the surplus valve 37 opens which permits escapement of the entrapped pum cylinder. Also, the lock-bar 72 israise by engagement thereon the slide 59 whereupon the engine valve 5 becomes shifted to its opposite position by the expanding action of the spring 71 causing reversal in the stroke of the pump and the return of its piston to the end of its downstroke. This palpitating operation is repeated until a suflicient quantity of liquid is drawn into the pump cylinder through the piston as to cause complete displacement of air entrap ed therein and overflow of the air and liquid through the surplus discharge port 23. In this manner the pump is normally maintained completely full of liquid.

After the pump has been completely primed, the up-stroke of the plunger immediately at the commencement thereof (Figs. 2, 5 and 27) the consequent pressure of liquid in the upper end .of the cylinder forces the check-valve 37 upwardly inopposition to the spring 42 in the thimble 43 causing discharge of liquid to take place through the surplus outlet port 23, the spring 34 for the checkvalve 34 beingof greater strength than the spring 42 prevents the check-valve 34 from, opening during escape of liquid through the surplus discharge port. WVhen the checkvalve 37 is thus raised the collar 86 on its stem 40 by engagement with the stud 85 throws the priming latch 81 out of engagement with the rack-memberas the upward stroke of the pump continues, and also the cam 48 is progressed until the roller 47 on the rocker 45 bears upon its concentric face 50 which causes the rocker to completely compress the thimble 43 against the collar 41 and thus holding the check-valve 37 firmly seated in closed position, after which upon further upward st'rokeof the piston, the pressure of liquid in the cylinder above the piston causes the check-valve 34 to rise in opposition to its spring 34 so that the discharge of liquid takes place through the dispensing port 24 continuously until the up-stroke of the piston is fully completed. By adjustment of the sleeve 78 on the lug 77 of the rack-member the length of the upward stroke of the pump maybe assured. I

The cam 48 and the priming latch 81 are operatively related with the surplus valve :37, and the cam is also operatively related with the pump piston, the arrangement being such that at the commencement of the upstroke of the pump the priming latch has engagement with the actuating mechanism of the pump or is moved out of engaging position therewith dependent upon the surplus valve being closed or opened. \Vhen the pump cylinder is completely filled with liquid the surplus valve is opened against resistance of its s ring 42 at the commencement of the up-stro e of the pump causing the priming latch to be moved out of engaging position whereupon full stroke of the pump takes place. However, when the pump cylinder contains air, the air becomes compressed therein as the pump piston moves upwardly, the surplus valve emg held in closed position by its spring 42, and thus the priming latch remains engaged-with the actuating mechanism causing reversal in the stroke of the pump which takes lace after opening of the surplus valve whic occurs when pressure of its spring 42 is relieved through action of the cam 48 and rocker 45 to (permit the entrapped air in the pump cylin er to escape through the surplus valve. By this provision full stroke of the pump and consequent discharge of liquid from the pump through the dispensing port is dependent upon any content of air in the pump cylinder being first excluded therefrom through the surplus valve, whereby is insured dispensation of only liquid from the pump.

The cam 48 is provided with a set-screw 48 in its hub and is rotatively adjustable on the shaft relative to the rack gear 53, so that by adjustment of the cam positive closing of the surplus valve may be made to occur at an earlier or later period in the up-stroke of the pump accordingly, and thus, the quantity of liquid discharged through the dispensing port is varied.

During the downward stroke ofthe pump piston a suflicient amount of liquid in the lower end of the cylinder escapes back through the opening 28 in the check-valve 26 (Fig. 4), the opening being so proportioned as to limit the escaping liquid to only a sufiicient amount as to compensate for the displacement of liquid in the pump cylinder above the plunger which is occasioned by the piston-rod therein. In this manner excessive discharge through the dispensing port or excessive pressure in the cylinder 15 prevented.

In connection with the hereinbefore described pumping mechanism is provided a register constituted of an indicator for the successive units of measured liquid as they are discharged through the dispensing port, and a counter of usual construction by which the dispensed units are summarized (Figs. 14, 15 and 16).

The counter consists of a circular case 87 having therein a partition 88 upon the front of which is secured a dial 89 displayingl an annular scale 90. A gear 91 (Fig. 11) aving a hollow hub 92 is rotatably mounted back of the partition 88, the ends of said hub having bearings respectively in said partition and a stationary bracket 93. Forwardly in the bore of said hub is loosely disposed a collar 94, and a shaft 95 extends loosely through the rear end of said hub 92, its forward end extending through said collar and having mounted thereon an index 96 disposed so as to be circulated in a plane in front of the dial upon rotation ofthe shaft. Upon the shaft 95 is disposed a compression sprin 97 that presses oppositely against said co er and the inner end of the hub whereby relative turning movement ofthe shaft and the gear is frictionally resisted so that upon rotary movement of the gear 91 the index 96 is progressed accordingly over the scale.

The counter 97 (Fig. 16) is positioned back of the partition 88 and is exposed through a sight opening 98 in the dial (Fig. 14) for convenient reading thereof, and has actuated relation with the gear 91 by means of suitable gear mechanism 99. I

The cam shaft 49 is operatively related with the gear 91 by any suitable mechanism which may include a gear 100 whereby movement is imparted to the gear 91 during that portion of the upstroke of the pump while liquid from the pump cylinder is being expelled through the dispensing port 24 so that the index 96 progresses clockwise to a propor-.

'- tionate extent. Such mechanism (Figs. 2, 36 .and 37) preferably consists of a drivin clutch member 115 operatively related wit the gear 100 so as to impartrotary movement to said gear in one direction only when oscillated, and another clutch member 116 arranged in operative relation with said gear so as to prevent retraction of said gear in the opposite direction. The driving clutch member 115 has a radially extending lug 117 disposed between spaced jaws 118 and 119 on a lever 120 that is secured on the cam-shaft 49, there being an adjusting screw 121 in the jaw 118 that has contact with the lug 117 during movement of the cam-shaft in one direction. The jaw 119 has contact with the lug 117 during movement of the cam-shaft in the opposite direction. The jaws on the lever 120 are so.spaced as to permit of more or less play of the lug on the driving clutch member between the jaw 119 and the screw 121. By this means, when the screw 120 is properly adjusted movement is imparted from the cam-shaft to the indicator gearin only during that portion of the stroke 0 the pump when the surplus valve is held positively closed and the discharge irom the pump takes place only through the dispensing port.

A latch-spring 101 secured in the case, one end of which projects loosely through the partition 88 and the dial 89 into the path of the index 96 constitutes a back-stop 102 so that said index upon backward movement thereof is arrested upon reaching its Zenith, or the zero point on the scale.

It is desirable that upon commencement of the dispensing operation that the index be reset to said zero point, and that the pump mechanism be reset to the point of commencement of its upstroke in order that the amount of liquid dispensed upon each operation be accurately indicated. For this purpose resetting mechanism is provided consisting of a longitudinally movable manually operated bar 103 (Figs. 12, 13, 15, 16, 29 and 31) having a tension spring 104 for holding it in its innermost position.

Secured to the inner portion of said bar in a plane parallel therewith and spaced apart therefrom is a wedge-shaped cam 105, there being studs-106 securing the same together, and upon said studs between the bar and cam is disposed a rack-plate 107, the lower edge thereof being notched. Said rack-plate has therein parallel slots 108 diagonally disposed through which the studs 106 loosely extend, and said rack-plate has a stud 109 having mounted thereon a detent spring 110 that has sliding movement ina horizontal slot 111 in the bracket 93, said slot being so proportioned as to admit also limited vertical movement therein of the stud 109. Thus, when the operating bar 103 is moved backwardly through action of its spring 10 1. said plate is first raised and then moved backwardly, and when said operating bar is pulled forwardly said rack-plate is first moved downwardly and then forwardly during which latter operation the toothed lower edge of the rack-plate is moved into engagement with a notched wheel 112 secured on the inner end of the shaft 95 for the index, causing backward roI ary movement thereof, whereby said index is reset against the backstop 102. The Wedge-cam 105 has longitudinal sliding movement on the bracket 93 as the bar 103 is actuated. and a roller on said slide 59 rests upon the slanting face of the cam so that as the operating bar 103 is drawn outwardly said slide is moved upwardly (Fig. 31) thereby causing the engine-valve 5 to become shifted to position for the down-stroke of the engine, whereupon the pump piston is returned to its lowermost position.

In using the invention the pipe 14 is connected with any suitable source of compressed air, and the outlet port has connected there with any convenient means through which the liquid is dispensed, such as a pipe 24 or hose, preferably having a manually operated discharge nozzle (not shown) ordinarily used in connection with liquid dispensing apparatus. The apparatus thus connected is positioned upon a container 113 with its base 2 resting upon the top thereof so as to cover the opening 114 therein and with its suction pipe 27 projected downwardly into the container. Also, the base 2 is positioned over the opening 114 so that the surplus discharge port 23 has free communication through said opening with the container.

\Vhen air pressure is applied through the pipe 14. the engine is activated causing reciprocation of the pump piston, whereupon liquid is drawn from the container through the suction pipe into the pump cylinder. Any content of air within the cylinder be comes expelled past the surplus outlet check valve 37, until the pump cylinder becomes completely filled with liquid. After the initial priming of the apparatus the quantity of liquid drawn into the pump upon each upward stroke of its piston is in excess of the predetermined quantity to be dispensed through the dispensing port, the excess amount being first expelled through the surplus discharge port 23 back into the container. the residue being expelled through the dispensing port'24 during completion of the up-stroke of the piston. Thus, the actual delivery of liquid through the dispensing outlet upon each complete operation of the pump is of the accurate quantity as predetermined.

I claim:

1. In dispensing apparatus, a. pump having an inlet. a surplus outlet and a dispensing out let port. valves for said inlet. outlet and port respectively, actuating mechanism for the pump having reversing means therefor operable normally at the end of each stroke 1- the pump, a lock normally pret venting reversal of said mechanism between the ends of the pump strokes, a surplus latch on said reversing means operativelv related with the sur plus outlet valve and disposed when the pump is at the commencement of its discharge stroke to engage said actuating mechanism or to be moved out of engaging position dependent upon closed or open position of the surplus outlet valve. a cam operated means driven by said actuating mechanism whereby the valve for said surplus outlet during the discharge-stroke is successively restrained yieldingly from opening, released and then held positively closed. and a spring on the valve for the dispensing port adapted to resist opening thereof with greater restraint than the yielding restraint applied to said surplus valve.

2. In dispensing apparatus, apump having .an inlet, a surplus outlet and a dispensing outlet port, valves for said inlet. outlet and port respectively, actuating mechanism for the pump having reversing means therefor operable normally at the end of each stroke of the pump, a priming latch on said reversing means operatively related with the surplus outlet valve and disposed when the pump is at the commencement of its discharge stroke to engage said actuating mechanism or to be moved out of engaging position dependent assume upon closed or open position of the surplus by said actuating mechanism whereby the valve for said surplus outlet during the discharge stroke is successively restrained yieldingly from opening. released and then held positively closed, and a spring on the valve for the dispensing port adapted to resist opening thereof with greater restraint than p the yielding restraint applied to said surplus valve.

3. In dispensing apparatus, a pump havin an inlet, a surplus outlet and a dispensing outlet, a spring-restrained check-valve controlling the dispensing outlet, another checkvalve controlling said surplus outlet, actuating mechanism for said pump, and means driven by said actuating mechanismand operatively related with the surplus valve, so disposed that during the first portion of the discharge stroke of the-pump said surplus valve is yieldingly restrained from opening, during the next succeeding portion of said stroke is free to open, and during the remaining portion is held positively closed, whereby discharge from the pump during said first and next succeeding portions of said stroke takes place only through said surplus outlet and during the remaining portion only through said dispensing outlet.

4. ln dispensing apparatus, a pump having a check-valve controlled inlet, a surplus outlet and a dispensing outlet. actuating mechanism for said pump, an individual checkvalve for each of said outlets, and means for controlling each outlet valve so disposed that during the first portion of the discharge stroke of the pump discharge therefrom takes place only through the surplus outlet and during the remaining portion only through the dispensing outlet.

5. A measuring pump having a cylinder provided with an inlet, a surplus outlet and a dispensing outlet, and a valvular piston provided with a piston rod therefor reciprocable in said cylinder between said inlet and said outlets, a check-valve controlling said inlet having a relief opening therein to permit back-flow therethrough sufiiciently to compensate for the displacement by the piston rod of liquid in the cylinder, a yieldingly restrained check-valve for said dispensing outlet, another check-valve for said surplus outlet, ,and means operatively related with said surplus check-valve disposed to permit opening thereof and discharge from the ump cylinder through. the surplus outlet uring a certain first portion of the discharge stroke of said piston and to positively close said surplus check-valve during the other portion of said discharge stroke whereby a. definite quantity of liquid is discharged from the pump through its dispensing outlet upon each complete operation of said pump.

6. A measuring pump having a cylinder provided with an inlet and an outlet port, and a reciprocating piston in said cylinder, a spring-pressed check-valve controlling the discharge. from said cylinder throu h the outlet port, and a vented chamber avin therein a piston secured to the stem of sai valve so arranged that said valve is balanced with respect to fluid ort.

7. A fluid measuring apparatus comprising a container for liquid a pum provided with a suction inlet connected witli said container, a valve-controlled surplus outlet communicating with said container and a yieldingly restrained valve controlled dispensing port, actuating means for the pum and a mechanism operatively related with said means and the valve for the surplus outlet so constructed that said surplus outlet valve is yieldingly restrained during the first portion of the upstroke of the pump, then relieved of yielding restraint durin V a succeeding portion of said upstroke an is positively clo%d during the remainin ortion of said u stroke, the valve for 88k? dispensing port eing adapted to permit discharge from the pump through the dispensing port only when the valve for the surplus outlet is positively closed.

8. A fluid measuring apparatus comprising a container for liquid, a pump provided with a suction inlet connected with said container, a valve controlled surplus outlet communicating with said container and a yieldingly restrained valve controlled dispensing port, actuating means for the pump, a mechanism operatively related with said means and the valve for the surplus outlet so constructed that said surplus outlet valve is yieldingly restrained during the first portion of the upstroke of the pump, then relieved of yielding restraint during asucceedin portion of said upstroke and is positively efiised during the remaining portion of said upstroke, the valve for said dispensing port being adapted to permit discharge from the pump through the dispensing port only when the valve for the surplus outlet is positively closed, and an indicator having operative connectionv with said mechanism so constituted that said inpressure in the outlet dicator is actuated upon operation of the pump only during the discharge of liquid through the dispensing outlet.

9. A fluid measuring apparatus comprising a containena measuring pump receiving fluid from said "container and having axdispensing port and provided with a surplus outlet through which fluid is returned to said 

